Rocket engines have a long history of obtaining combustion temperatures far in excess of what their combustion chamber would tolerate under static conditions, b

Rocket engines have a long history of obtaining combustion temperatures far in excess of what their combustion chamber would tolerate under static conditions, but yeah, 25kK vs 2kK seems excessive. Also, chemical rockets have an easier time with this trick because the heat is generated inside the propellant, so you just have to stop it from getting out quickly, and the fuel itself is cryogenic and makes for a very convenient coolant. Still, the fact that the article makes a big deal out of quartz being transparent in the UV makes me wonder if there isn't a clever trick up someone's sleeve. Ideas?